Function imageproc::hog::render_hist_grid

pub fn render_hist_grid(
    star_side: u32, 
    grid: &View3d<f32>, 
    signed: bool
) -> Image<Luma<u8>>

Visualises an array of orientation histograms. The dimensions of the provided Array3d are orientation bucket, horizontal location of the cell, then vertical location of the cell. Note that we ignore block-level aggregation or normalisation here. Each rendered star has side length star_side, so the image will have width grid.lengths[1] * star_side and height grid.lengths[2] * star_side.